/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shenyu.plugin.jwt.strategy;

import io.jsonwebtoken.Jwt;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.JwtParserBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.security.Keys;
import org.apache.shenyu.plugin.jwt.exception.ThrowingFunction;
import org.apache.shenyu.spi.Join;

import java.util.Map;
import java.util.Objects;

@Join
public class DefaultJwtPayloadParseStrategy implements JwtPayloadParseStrategy {

    @Override
    public Map<String, Object> parse(final String secretKey, final String authorization) {
        JwtParserBuilder jwtParserBuilder = Jwts.parser();
        jwtParserBuilder.verifyWith(Keys.hmacShaKeyFor(secretKey.getBytes()));
        JwtParser jwtParser = jwtParserBuilder.build();
        if (jwtParser.isSigned(authorization)) {
            Jwt jwt = ThrowingFunction.wrap(() -> jwtParser.parse(authorization));
            return Objects.isNull(jwt) ? null : (Map<String, Object>) jwt.getPayload();
        }
        return null;
    }
}